I have long tube ceramic coated headers and need to have a bung welded in. I'm not to wild about welding on my headers. Would it greatly reduce the
effectiveness of the sensor if I put it in the collector pipe just beyond the headers? Or is there an alternative to welding?


Thanks Jack

It will still work fine there, especially if it is an O2 sensor with a heater circuit. Just make sure that it is mounted "up" to help it last longer.

Mike

For what use? If you're running it for fuel injection then a heated O2 will probably work OK in the adapter right after the collector. They tend to get sluggish at idle though. I will guarantee you that a 1-wire O2 (not heated) will not work there.

Peter

I'm using a heated sensor mounted in the adapter. Both the headers & adapter are coated. Works fine.

FWIW- I had an unheated sensor at first and didn't notice any difference when I went heated. I've got an autometer Air/Fuel gauge and both sensors react similarly.

Napa sells those spark plug anti foul deals that work as O2 sensor bungs. They are in the "HELP" section.

I'm bringing this thread back because I have another question...

How far back can you realistically go and still get good, accurate readings that will compare to a bung welded in the headers? I don't like the idea of putting one in my headers either, so I was thinking of putting it behind the collector in the exhaust pipe itself.

I was also thinking about putting it on the blockoff plate on one of my cutouts. Is there enough fresh exhaust flow going to the plates to read right?